Re: slow cranking '51 300

Posted by Wesley Boyer On 2013/2/10 20:49:52

Casey,
Lets go over this, you replaced a Rod bearing and rings just in one cylinder. Than with the head off it cranked over fine. (Correct?)
Next you put the head on with the spark plugs installed and it cranks over slowly. (Correct?)
If both are Correct, I would look at the cables not able to carry enough current, next does your battery have enough juice and last is your starter good. If the starter is not using all the brushes, I would think without a load (Head removed) it would look like it is turning over the engine just fine. But if a brush or two isn't making contact and a high load it would turn slower.
This is what I would look into, maybe I'm missing something here but if you had a problem with the head removed than I would say look at the rings and bearings.
Wes